What is the ability to store energy in a magnetic field called?

The ability to store energy in a magnetic field is known as inductance. This property is a fundamental aspect of inductors, which are passive electronic components specifically designed to take advantage of this property. When current flows through an inductor, it creates a magnetic field around it. If the current changes, the magnetic field also changes, which induces a voltage in the inductor that opposes the change in current (as described by Lenz's law). This characteristic enables inductors to store energy temporarily in the form of a magnetic field, which can be used in various applications, such as filters, oscillators, and energy storage systems.

In contrast, admittance relates to the measure of how easily alternating current can flow through a circuit, while capacitance refers to the ability to store energy in an electric field. Resistance measures the opposition to current flow in a circuit. Each of these concepts plays a role in electrical circuits, but inductance specifically pertains to the energy storage aspect associated with magnetic fields.